(1. 東北大學(xué) 材料與冶金學(xué)院，沈陽(yáng) 110004；2. 沈陽(yáng)理工大學(xué) 材料科學(xué)與工程學(xué)院，沈陽(yáng) 110168)
摘 要: 采用自制的波浪型傾斜板振動(dòng)裝置對(duì)AZ91D鎂合金半固態(tài)坯料的制備及觸變成形進(jìn)行研究。結(jié)果表明，在傾角為45˚，振幅1.45 mm，澆注溫度630~650 ℃的條件下，采用波浪型傾斜板振動(dòng)技術(shù)可以制備出組織優(yōu)良的半固態(tài)AZ91D鎂合金坯料，坯料由細(xì)小的等軸晶組成，并在二次加熱溫度為575 ℃、保溫時(shí)間30~60 min的條件下球化理想。通過(guò)觸變鍛壓，在模具的預(yù)熱溫度為400~450 ℃時(shí)，制備出表面光潔、組織優(yōu)良的成品制件。觸變鍛壓時(shí)，液相流動(dòng)是主要的變形方式。制品上部由于液相偏聚，硬度較低；下部由于固相的微塑性變形，硬度較高。
關(guān)鍵字: AZ91D鎂合金；波浪型傾斜板；振動(dòng)；半固態(tài)；觸變成形
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;2. School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110168, China）
Abstract:Abstract: Preparation of semisolid billets of AZ91D magnesium alloy and thixoforming by using self-made wavelike sloping plate setup were studied. It is shown that, when the sloping anger is 45˚, the amplitude is 1.45 mm and the casting temperature is 630−650 ℃, the semisolid billets with good microstructures can be prepared. The billets are composed of fine equiaxed grains. When the billets are remelted at 575 ℃ for 30−60 min, spheroidization of the semisolid billet is perfect. When the mould preheating temperature is 400−450 ℃, thixoforming product with fine surface and good microstructures can be manufactured. During thixoforging, liquid flow is the main deformation pattern. Due to the liquid aggregation in the upper part of the product, the corresponding hardness is lower; however, there is a small solid plastic deformation in the bottom of the product, so the corresponding hardness is higher
Key words: AZ91D magnesium alloy; wavelike sloping plate; vibration; semisolid; thixoforming
